f2fs: change recovery policy of xattr node block

Currently, if we call fsync after updating the xattr date belongs to the
file, f2fs needs to trigger checkpoint to keep xattr data consistent. But,
this policy cause low performance as checkpoint will block most foreground
operations and cause unneeded and unrelated IOs around checkpoint.

This patch will reuse regular file recovery policy for xattr node block,
so, we change to write xattr node block tagged with fsync flag to warm
area instead of cold area, and during recovery, we search warm node chain
for fsynced xattr block, and do the recovery.

So, for below application IO pattern, performance can be improved
obviously:
- touch file
- create/update/delete xattr entry in file
- fsync file

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 17 insertions, 12 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 8203a2f8b350..f8fb25a27b46 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -971,9 +971,6 @@ int truncate_xattr_node(struct inode *inode, struct page *page)
 
 	f2fs_i_xnid_write(inode, 0);
 
-	/* need to do checkpoint during fsync */
-	F2FS_I(inode)->xattr_ver = cur_cp_version(F2FS_CKPT(sbi));
-
 	set_new_dnode(&dn, inode, page, npage, nid);
 
 	if (page)
@@ -2054,18 +2051,18 @@ update_inode:
 	f2fs_put_page(ipage, 1);
 }
 
-void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
+int recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	nid_t prev_xnid = F2FS_I(inode)->i_xattr_nid;
 	nid_t new_xnid = nid_of_node(page);
 	struct node_info ni;
+	struct page *xpage;
 
-	/* 1: invalidate the previous xattr nid */
 	if (!prev_xnid)
 		goto recover_xnid;
 
-	/* Deallocate node address */
+	/* 1: invalidate the previous xattr nid */
 	get_node_info(sbi, prev_xnid, &ni);
 	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
 	invalidate_blocks(sbi, ni.blk_addr);
@@ -2073,19 +2070,27 @@ void recover_xattr_data(struct inode *inode, struct page *page, block_t blkaddr)
 	set_node_addr(sbi, &ni, NULL_ADDR, false);
 
 recover_xnid:
-	/* 2: allocate new xattr nid */
+	/* 2: update xattr nid in inode */
+	remove_free_nid(sbi, new_xnid);
+	f2fs_i_xnid_write(inode, new_xnid);
 	if (unlikely(!inc_valid_node_count(sbi, inode)))
 		f2fs_bug_on(sbi, 1);
+	update_inode_page(inode);
+
+	/* 3: update and set xattr node page dirty */
+	xpage = grab_cache_page(NODE_MAPPING(sbi), new_xnid);
+	if (!xpage)
+		return -ENOMEM;
+
+	memcpy(F2FS_NODE(xpage), F2FS_NODE(page), PAGE_SIZE);
 
-	remove_free_nid(sbi, new_xnid);
 	get_node_info(sbi, new_xnid, &ni);
 	ni.ino = inode->i_ino;
 	set_node_addr(sbi, &ni, NEW_ADDR, false);
-	f2fs_i_xnid_write(inode, new_xnid);
+	set_page_dirty(xpage);
+	f2fs_put_page(xpage, 1);
 
-	/* 3: update xattr blkaddr */
-	refresh_sit_entry(sbi, NEW_ADDR, blkaddr);
-	set_node_addr(sbi, &ni, blkaddr, false);
+	return 0;
 }
 
 int recover_inode_page(struct f2fs_sb_info *sbi, struct page *page)